I guess I'd define bang-for-the-buck as the most universally pleasant for the price paid. I know "universally" is a tough concept, but I'll defer to those of you with keener ears, more demanding tastes, and far wider experience and closets full of gear.

For the record, I really do listen to smatterings of every genre, so I do apply "universal" in a very expansive sense: anything from classical music to hip hop, EDM, pop, big band, rockabilly, and folk.